\unitlength=1.00mm
\special{em:linewidth 0.4pt}
\linethickness{0.4pt}
\begin{picture}(119.00,45.00)
\bezier{268}(42.00,21.33)(65.33,45.00)(89.67,21.33)
\bezier{256}(42.00,21.00)(66.67,0.00)(89.67,21.33)
\put(42.00,21.00){\circle*{1.33}}
\put(89.33,21.33){\circle*{1.33}}
\put(65.67,35.67){\makebox(0,0)[cc]{$u$}}
\put(65.67,6.67){\makebox(0,0)[cc]{$v$}}
\put(13.00,18.33){\makebox(0,0)[cc]{$\imath$}}
\put(119.00,18.33){\makebox(0,0)[cc]{$\tau$}}
\put(15.00,21.00){\line(1,0){26.33}}
\put(90.00,21.00){\line(1,0){27.00}}
\put(117.00,21.00){\circle*{1.33}}
\put(15.00,21.00){\circle*{1.33}}
\put(28.67,23.33){\makebox(0,0)[cc]{$p$}}
\put(103.00,23.33){\makebox(0,0)[cc]{$q$}}
\end{picture}
